I have done some videos with me GoPro, so if there is some free time I will try to load up.
At the moment I am very busy to finish the intake area and make the electronic wiring like in the automotive industry...
I will be in Corsica for three weeks to test everything again.
What kind of battery do you use?

No it is just for fun
At the moment I am using Kokam pouch cells 14S1P.
I have worked in the automotive industry and also some years in the formular 1, that is the reason for doing everything in carbon.
My first board was finished 2013, at those days it would have been the right time to think about selling it. Today there are a lot of products on the market.
What kind of remote are you using? That is one of the last big challenges, the waterproof issue.

No it is just for fun
At the moment I am using Kokam pouch cells 14S1P.
I have worked in the automotive industry and also some years in the formular 1, that is the reason for doing everything in carbon.
My first board was finished 2013, at those days it would have been the right time to think about selling it. Today there are a lot of products on the market.
What kind of remote are you using? That is one of the last big challenges, the waterproof issue.

thats cool, im also automotive industry engineering

i plan on designing/making a remote using some off the shelf components,linear potentiometer for trigger. machined casing, and injection mould some latex water seales/gaskets etc

Yeah looks really good and a little funny.
Have you the possibility to check the speed with a GPS?
Should be something around 25-30 km/h...or?
Have you limited the rpm? From the sound it is round about 13500-14500?
Looks really good, go on with optimization

i didnt recveive the esc yet. mgm said it would take 3 weeks to complete, but it then took nearly 2 weeks just to get an order confirmed from them, ultra slow response via email. its now been 5 weeks since i started the process

feeling a bit frustrated

Hope that it will arrive soon.
Would like to hear your experience before I order same parts.

Hi srn.

so my first impressions are the mgm esc is very very good indeed. i bought the industrial version, so i dont know exactly how different it is from the modeller version. it was pretty expensive at 1100 euro. but the temperature protection works great as i found out today. extremely well manufactured piece of hardware, the software setup works great, i fully recommend it if you wanna spend the bucks.

also the lehner 7050 motor works great, i gave it some abuse today, and it looks, and smells brand new, so i would recommend this also. how is your project coming along?

so my first impressions are the mgm esc is very very good indeed. i bought the industrial version, so i dont know exactly how different it is from the modeller version. it was pretty expensive at 1100 euro. but the temperature protection works great as i found out today. extremely well manufactured piece of hardware, the software setup works great, i fully recommend it if you wanna spend the bucks.

also the lehner 7050 motor works great, i gave it some abuse today, and it looks, and smells brand new, so i would recommend this also. how is your project coming along?

Hello chris,

MGM was also recommending me the pro version for around 1100€. But I still think the hobby version for 700€ might be enough.

I nearly finished my drive unit with a gearing to increase the height of my drive shaft.
Next step is to install the aluminum plate into my carbon board. I am thinking whether to glue or to screw it.

so my first impressions are the mgm esc is very very good indeed. i bought the industrial version, so i dont know exactly how different it is from the modeller version. it was pretty expensive at 1100 euro. but the temperature protection works great as i found out today. extremely well manufactured piece of hardware, the software setup works great, i fully recommend it if you wanna spend the bucks.

also the lehner 7050 motor works great, i gave it some abuse today, and it looks, and smells brand new, so i would recommend this also. how is your project coming along?

Hello chris,

MGM was also recommending me the pro version for around 1100€. But I still think the hobby version for 700€ might be enough.

I nearly finished my drive unit with a gearing to increase the height of my drive shaft.
Next step is to install the aluminum plate into my carbon board. I am thinking whether to glue or to screw it.

Hello
I will sell my MGM compro industrial version.
It is the 250 63V...
Reason I will use a another more or less self developed one.
It works well with the TorQstar
It has an Emergency OFF, logging, PWM input, additional water sealing and water cooling.

I've just finished reading the whole thread, some of this stuff looks amazing. currently working on building my esurf board (pictures to come) i was scrolling around and found this, thought you guys would get a kick out of it!

I have the same waterjet project; thank you for these thread (I have almost all read) it is very interesting with some incredible designs!
I have a question, maybe can you help me...
I'm designing 2 waterjets (one with a 58mm impeller and one with 80mm impeller), but I have not chosen the motor yet (I will first test the 58mm version).
How can we know the maximum speed (RPM) of the impeller according to its size? a 80mm diameter impeller can not turn as fast as a 58mm (to avoid cavitation).
Is there a "rule" to know the maximum speed of an impeller? (in order to be able to deduce the "KV" of the motor)

there is no rule because it highly depends on impeller design.
I was reading many numbers between 8.000 and 15.000 rpm.

For my project I ordered a powerful motor (Lehner Torqstar 3) and will test my relatively small impeller (60mm) from 0 - 17.000 rpm.
Diagrams of thrust/rpm and rpm/power will show where this impeller has best efficiency. And if my motor is too bored at this rate, I have to increase impeller size.

Also, I saw that you are going for a gearbox build. That's actually the way I was going too before I noticed that at that rpm range, the gearbox is going to be really really hot. Did you already think how to cool the gears?

Also, I saw that you are going for a gearbox build. That's actually the way I was going too before I noticed that at that rpm range, the gearbox is going to be really really hot. Did you already think how to cool the gears?

Cheers

Interesting point, have not thought about this yet. My "Gearbox" are just two gears to increase the height of the shaft. I will measure the temp on the gears.